[C API] Remove _Py_NewReference() and _Py_ForgetReference() from the public C API

BPO	40989
Nosy	@scoder, @vstinner
PRs	bpo-40989: PyObject_INIT() becomes an alias to PyObject_Init() #20901 bpo-40989: Move _Py_NewReference() to the internal C API #20904 bpo-40989: Make _PyTraceMalloc_NewReference() internal #20915 bpo-40989: Fix compiler warning in winreg.c #21722

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-09-21.21:57:43.476>
created_at = <Date 2020-06-15.21:05:35.371>
labels = ['expert-C-API', '3.10']
title = '[C API] Remove _Py_NewReference() and _Py_ForgetReference() from the public C API'
updated_at = <Date 2021-09-21.21:57:43.475>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-09-21.21:57:43.475>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-21.21:57:43.476>
closer = 'vstinner'
components = ['C API']
creation = <Date 2020-06-15.21:05:35.371>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 40989
keywords = ['patch']
message_count = 11.0
messages = ['371597', '371600', '371604', '371654', '371656', '371671', '371711', '371715', '374883', '380890', '402377']
nosy_count = 2.0
nosy_names = ['scoder', 'vstinner']
pr_nums = ['20901', '20904', '20915', '21722']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40989'
versions = ['Python 3.10']